Rotary pump



W. L. DAVIS ROTARY PUMP July 4, 1944.

OriginalzFiled Nov. 5, 1939 INVENT OR. MN L. 04 V/5 w a; W

- ATTORNEY$ LM T Patented July 4, 1944 UNITED STATES PATENT-OFFICE ROTARY PUMP Waiwin L. Davis, Avon, Ohio, assignor to Everett D. McCurdy, Cleveland, Ohio, as trustee Original application November 3, 1939, Serial No. 302,736. Divided and this application October 24, 1941, Serial No. 410.362

Claims.

of one-piece construction so formed that they can be assembled into or removed from the piston by simply inserting them through the piston slots.

Another object of my invention is to provide an improved rotary pump of the type having a piston slotted intermediate its ends and carrying a-"pair of vanes arranged in intersecting diametrically extending planes, in which the vanes are pf one-piece construction with one vane extending through a recess of the other vane and cooperating portions of the piston and said one vane are so formed that the latter can be assembled into or removed from the piston by edgewise movement through a slot of the piston and the recess of the other vane.

Other objects and advantages of my invention will be apparent from the following description when taken in conjunction with the accompanying sheet of drawings in which:

Fig. 1 is a side elevation, with parts broken away, showing a rotary pump embodying my invention;

Fig. 2 is a transverse sectional view taken through the pump on line 22 of Fig. 1;

Fig. 3 is an end view of the piston removed from the pump and illustrating the operation of assembling the vanes into the piston;

Fig. 4 is a side view, more or less diagrammatic in form, further showing how the vanes can.be inserted into or removed from the piston; and

Fig. 5 is a perspective view showing one of the vanes removed from the piston.

This application is a division of m original application Serial No. 302,736 filed November 3, 1939, now Patent Number 2,293,119 granted August 18, 1942.

In the embodiment Of my invention illustrated in the accompanying drawing, I show a rotary pump comprising in general a casing or housing provided with fluid inlet and outlet passages and a piston 12 rotatable in the housing and carrying a pair of vanes 13 and I4 extending diametrically at substantially right angles to each other. The body of the piston and the intersecting "through vanes thereof are each of onepiece construction and are so formed that the vanes can be assembled into or removed from the piston by edgewise movement through the slots thereof, as will be further explained hereinafter.

As shown in the drawing the housing Ill has a cylindrical liner ll thereinand the piston I2 is mounted eccentrically for rotation in the liner. The vane 13 is slidably mounted in the opposed slots I5 and I6 of the piston, and similarly, the

vanell is slidably mounted in the opposed slots l1 and 18 of the piston.

The piston 12 is of one-piece construction and comprises a hollow or recessed cylindrical body having end walls and substantially axially aligned shaft projections 19 and on such walls by which it is mounted in suitable bearings provided in the housing 10. The radial slots in which the vanes 13 and 14 are mounted extend axially of the piston but terminate inwardly of the ends thereof as indicated in Fig. 1, the axial length of these slots being substantially equal to the axial length of the cylinder chamber 8| defined by the liner I I.

The vanes I3 and I4 each have a one-piece body of an axial length substantially equal to that of the radial slots of the piston in which they are operablymounted and have a width such that their opposite side edges are maintained in running contact with the inner face of the liner during rotation of the piston. The edges of the vanes may be shaped for direct contact with the liner or may have grooves therein in which the contact elements 82 are mounted.

To permit these one-piece vanes 13 and 14 to be assembled into or removed from the piston 12 through the slots thereof, and to permit them to operate in the piston in the intersecting relation above mentioned, I form the vanes with a recess or opening 83 therein which extends for a substantial distance axially of the vane and opens through an end thereof between the side or edge portions 83a and 83b. The vanes 13 and It may be identical in size and shape and from the illustration in Fig. 5, it will be seen that they are of recessed quadrangular form and may be conveniently referred to as being substantially C-shaped.

In assembling the vanes into the piston 12, one Of the vanes, for example the vane 13, is first inserted through one of the pair of slots provided therefor. sembled into position by edgewise movement through the slot 11 and in so doing. the side portion 83a thereof is inserted or hooked through the slot I? and is passed through the recess or opening 83 of the previously inserted vane 13 thereby bringing the vane H to the tilted or m The remaining vane I4 is then asclined dotted-line position Ila, shown in Fig. 4. By a combined edgewise' swinging or further tilting movement, the vane I4 can then be moved from the position Ila to the dotted-line position Ilb and then from the latter position the vane can be shifted diametrically of the piston to bring the same to the full-line position shown in Fig. 4 in which the vanes 13 and H are fully assembled in the piston and extend in intersecting relation therethrough. The above-described edgewise moyement, by which the second vane is assembled in-to the one-piece piston while the other vane is in its slot, may also be described as a combined angular and radial movement.

For the removal of the vanes from the piston, the reverse of the above-described operation is followed, that is to say, the vane 14 is first shifted diametrically of the piston to the dottedline position "b from which it is then withdrawn by a combined tilting and swinging movement during which it assumes or passes through the dotted-line position 14a. preliminary to the passage of the side portion 83a through the recess 83 of the vane I3 and the complete withdrawal of the vane through the slot 11 of the piston. In thus assembling the vanes into or removing the same from the piston 12, the operation is begun by inserting either vane into the piston first and following up the operation by the insertion of the other vane. This is made possible by the fact that the vanes 13 and 14 are of substantially identical shapeand construction and are interchangeable.

To enable the above-described operation of assembling the vanes into or removing the same from the piston 12 to be readily carried out, I construct the hollow body of the piston so that the internal chamber or recess 85 thereof extends axially a short distance beyond or outwardly of the ends of the slots in which the vanes are mounted. In other words, the ends of the internal chamber or recess 85 are extended, by coring into the end walls of the piston or other suitable manner of construction, as indicated at 85c and 85b and these extensions accommodate and provide clearance for the corners 83c and 83d of the vane 14 during the edgewise angular swinging and tilting movement thereof. The end extensions 85w and 85b of the chamber or recess of the piston may be formed of the same size or diameter as the main intermediate portion of the chamber.

I desire it to be understood that throughout the specification and claims where reference is made to the vanes as being of one-piece construction or as having a single-piece body, these or similar expressions are intended to mean a vane having a unitary body formed from a single-piece of material as distinguished from vanes having a body formed of separate parts which are assembled or connected with each other. It should also be understood that the above quoted or similar expressions are intended to include all vanes of the type shown in the accompanying drawing regardless of whether or .not they are provided at their tips with sepvane can be assembled into or removed from the piston by edgewise angular movement through a slot of the piston and the recess of the other vane.

While I have illustrated and described my improved rotary pump construction in a more or less detained manner, it will be understood, of course, that the invention is not limited to the particular pump and details of construction herein disclosed, but may be embodied in various other similar devices and specific constructions coming within the scope of the appended claims.

Having thus described my invention, I claim:

1. In a rotary pump, a cylinder, a one-piece piston'eccentrically mounted in the cylinder and rotatable therein, said piston being provided with end walls and an internal recess and having pairs of opposed radial slots communicating with the piston recess and terminating inwardly of said end walls, and a pair of one-piece vanes mounted in said slots in intersecting relation to each other, said vanes beingsubstantially C- shaped so that each vane has a recess extending axially thereinto and through which recess a portion of the other vane extends when both vanes are in assembled relation in said piston, the recesses of said vanes and the recess of the piston being of a size and shape such that when one of said vanes is disposed in one pair of said slots of the other vane can be assembled into or removed from the other pair of said slots by edgewise angular movement in such other pair of slots and through the recess of said one vane.

2. In a rotary pump, a cylinder, a one-piece piston eccentrically mounted in the cylinder and rotatable therein and provided with axial slots which terminate inwardly of the end walls of the piston, said piston having an internal recess with which said slots communicate and which is of greateraxial length than the slots, and a pair of one-piece vanes extending diametrically of the piston through said slots in intersecting relation and at substantially right angles to each other, said vanes being substantially C-shaped so that each vane has a recess extending axially thereinto and through which recess a portion of the other vane extends when both vanes are in assembled relation in said piston, the recesses of saidvanes and the recess of the piston being so shaped that one vane is adapted to be assembled into or removed from the piston by edgewise movement of the recessed portion of said one vane angularly and radially through the recessed portion of the other vane.

3. In a rotary pump, a housing having a cylinder therein, a one-piece piston in said cylinder comprising a substantially cylindrical hollow body having end walls provided with means for rotatably mounting the piston in eccentric relation in said cylinder, said hollow body having pairs of opposed radial slots terminating inwardly of the end walls of the body and having an internal recess with which said slots communicate and which is of greater axial length than the slots, and a pair of one-piece vanes mounted in said slots and extending substantially diametrically of the piston body in intersecting relation to each other, said vanes being substantially 6- shaped so that each vane has a recess extending axially thereinto and through which recess a portion of the other vane extends when both vanes are in assembled relation in the piston. the recesses of said vanes and the recess of said piston body being of a size and shape-such that when one of said vanes is disposed in one pair of said slots the other vane can be assembled into or removed from the piston by edgewise angular movement in the other air of said slotsand through the recess of the other vane.

4. In a rotary pump, a cylinder, a one-piece rotatable piston eccentrically mounted in said cylinder and having pairs of opposed radial slots 1 terminating inwardly of the ends of the piston, and a, pair of one-piece vanes mounted in said slots and extending in intersecting relation to each other, said vanes being substantially ,6- shaped so that each vane has a recess extending axially thereinto and through which recess a portion of the other vane extends when both vanes are in assembled relation in said piston, said piston having an internal recess therein extending outward beyond the ends of at least one pair of said slots, said internal recess of the pis' ton and the recesses of the vanes being oi a size and shape to permit one of said vanes to be 111 serted into or removed from said one pair of slots by edgewise angular and radial movement while the other vane is in the other pair of said slots.

5. In a rotary pump, a housing having a cylinder thereima one-piece piston having a substantially cylindrical body portion rovided with pairs of opposed radial slots which terminate inwardly of the ends of said body portion, means mounting said piston eccentrically in said cylinder for rotation therein, said piston having an internal recess with which said slots communicate and which is of an axial length to extend outwardly beyond the ends of at least one pair of said slots, and a pair of one-piece vanes mounted in said slots and extending substantially diametrically throughthe piston in intersecting relation to each other, said vanes being substantially C-shaped so that each vane has a recess extending axially thereinto and through which recess a portion of the other vane extends when both vanes are in assembled relation in said piston, the recesses of said vanes and the recess of said piston being of a size and shape to permit one vane to be inserted into or removed from said one pair of slots by edgewise angular and radial movement through the recess of the other vane while the latter vane is in the other pair of said slots, said piston recess providing clearance for the corners of'said one vane during said edgewise movement.

WALWIN L. DAVIS. 

